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Distance in Space:- It is a unit of length used for
- expressing astronomical distances.
- A light-year is a distance that light travels in a vacuum in a year.
- It is used while expressing distances to stars and other distancesmon a galactic scale.
Space-Time:
- It is a mathematical model.
- It merges the three dimensions of space and the dimension of time into a single four-dimensional manifold.
Speed of Light:
- The speed of light in a vacuum is
- denoted as constant c.
- It is a universal physical constant of physics.
- Its value is approximately 3x10^8 m/s and exactly 299 792 458 m / s.
- The speed at which light propagates through transparent materials, such as glass or air, is always less than c.
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